US4917276A - Sliding gate nozzle for special steel - Google Patents

Sliding gate nozzle for special steel Download PDF

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Publication number
US4917276A
US4917276A US07/217,500 US21750088A US4917276A US 4917276 A US4917276 A US 4917276A US 21750088 A US21750088 A US 21750088A US 4917276 A US4917276 A US 4917276A
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US
United States
Prior art keywords
weight
zirconia
refractory material
nozzle
grain size
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/217,500
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English (en)
Inventor
Hiroshi Shikano
Toshihiro Suruga
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kurosaki Refractories Co Ltd
Original Assignee
Kurosaki Refractories Co Ltd
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Application filed by Kurosaki Refractories Co Ltd filed Critical Kurosaki Refractories Co Ltd
Assigned to KUROSAKI REFRACTORIES CO., LTD. reassignment KUROSAKI REFRACTORIES CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SHIKANO, HIROSHI, SURUGA, TOSHIHIRO
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/08—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like for bottom pouring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
    • B22D41/28—Plates therefor
    • B22D41/30—Manufacturing or repairing thereof
    • B22D41/32—Manufacturing or repairing thereof characterised by the materials used therefor

Definitions

  • the present invention relates to a sliding gate nozzle showing stable durability in use for special steel, particularly Ca alloy-deoxidized steels.
  • alumina-carbon refractories have been used widely in recent years to prevent fuming due to pitch, which has conventionally been used in the plate, in order to achieve higher durability and service environments.
  • a sliding gate nozzle plate of a zirconia-based material lacks stability in spalling resistance and, therefore, does not promise satisfactory durability of the sliding gate nozzle for receiving a melt of special steel, particularly a molten steel deoxidized with Ca alloy.
  • FIG. 1 illustrates of an assumed mechanism of corrosion of a sliding nozzle plate at the sliding surface when a melt of a Ca alloy-deoxidized steel is received by the sliding nozzle plate;
  • FIG. 2 is an enlarged view of a major portion of FIG. 1.
  • Corrosion of the plate of a sliding gate nozzle is caused by the mechanism illustrated in FIGS. 1 and 2.
  • FIG. 1 shows the condition of erosion due to formation of a reactive gas in the space 4.
  • Ca is liberated from the molten steel as a gas due to its low boiling point and reacts with an O 2 gas penetrating between the upper plate 2 and the lower plate 3, to form CaO.
  • the CaO thus formed chemically reacts with plate components to form a low melting point substance based on, for example, Al 2 O.SiO 2 .CaO or Al 2 O 3 .CaO, thereby causing local corrosion of the plate, particularly at the sliding surface of the upper plate 3. Consequently, the corrosion consists mainly of damage to the structure of the refractory at the sliding surface, rather than enlargement of the aperture of the nozzle hole in the plate.
  • a zirconia refractory having a specified composition is applied at least to the part where the local corrosion would otherwise take place.
  • a sliding gate nozzle comprising a sliding nozzle plate sliding surface having satisfactory corrosion resistance for receiving a Ca alloy-containing special steel, without any essential modification to the conventional construction.
  • the above-mentioned object is attained by the use of a zirconia-carbon based material which does not form a low-melting substance with CaO formed in the negative-pressure space when the melt of a Ca-containing special steel is fed to the sliding gate nozzle and which has both spalling resistance and corrosion resistance necessary for the function of a sliding nozzle plate, at the nozzle hole and the surrounding portions.
  • zirconia used for the zirconia-carbon based material is unstabilized zirconia alone, a fired body obtained has many cracks due to the strain of rapid thermal expansion at the transition point peculiar to zirconia, and the product yield is poor.
  • partially stabilized zirconia with a controlled particle size of 10 mesh or below is used.
  • the fired body obtained has many problems relating to surface properties and is unable to accomplish the function of a sliding nozzle plate.
  • the partially stabilized zirconia should be used in an amount of at least 53% by weight, from the viewpoint of spalling resistance and corrosion resistance, particularly corrosion resistance. Unstabilized zirconia may be added in an amount of up to 30% by weight, whereby the spalling resistance of the fired body is a little enhanced.
  • the metallic silicon added should have a Si content of at least 85% by weight, and the carbon powder should have a fixed carbon content of at least 80% by weight. If the metallic silicon powder and the carbon powder have respective purities below the above-mentioned and have particle sizes of greater than 100 mesh, the reaction of metallic silicon and carbon will be insufficient.
  • a complex sliding nozzle plate with the zirconia-carbon material of the present invention adhered to and around a nozzle hole or the entire sliding surface of the plate by a refractory adhesive has excellent durability, free of the adnormal corrosion as generated in conventional alumina-carbon material at the time of receiving a melt of a special steel. Besides, the sliding nozzle plate can be produced in a high yield, without generation of cracks or the like.
  • compositions of refractory powders shown in Table 1 were mixed by using an organic binder, and the resultant mixtures were subjected to molding, reductive firing (1350° C.) in coke, impregnation with pitch, and firing (1000° C.).
  • the samples thus prepared were used to line a high frequency induction furnace, then a mixture of a Ca-containing powder and pig iron was placed in the furnace, and the temperature was rapidly raised to 1650° C. After the furnace temperature was maintained at that temperature for 3 hours the corrosion of each sample was measured to verify the corrosion resistance of each material.
  • compositions of refractory powders shown in Table 3 were mixed by using an organic binder to prepare the blended materials.
  • the sliding nozzle plate base material A was produced by molding by a friction press and the steps of reductive firing (1350° C.), impregnation with pitch, and firing (1000° C.). The quality of the products was checked.
  • the materials which showed favorable quality, Z2 and Z4 were adhered to the base material A by a refractory adhesive to obtain finished sliding nozzle plates.
  • the sliding nozzle plates were subjected to practical furnace tests at ironworks at which Ca alloy-deoxidized steels are currently produced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Furnace Charging Or Discharging (AREA)
US07/217,500 1987-07-15 1988-07-11 Sliding gate nozzle for special steel Expired - Fee Related US4917276A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP62-177823 1987-07-15
JP62177823A JPS6424069A (en) 1987-07-15 1987-07-15 Brick of sliding nozzle plate for special steel

Publications (1)

Publication Number Publication Date
US4917276A true US4917276A (en) 1990-04-17

Family

ID=16037726

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/217,500 Expired - Fee Related US4917276A (en) 1987-07-15 1988-07-11 Sliding gate nozzle for special steel

Country Status (6)

Country Link
US (1) US4917276A (ko)
EP (1) EP0299441B1 (ko)
JP (1) JPS6424069A (ko)
KR (1) KR890001666A (ko)
BR (1) BR8803539A (ko)
DE (1) DE3875833T2 (ko)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5335833A (en) * 1992-09-14 1994-08-09 Vesuvius Crucible Company Zirconia graphite slide gate plates
US20050280192A1 (en) * 2004-06-16 2005-12-22 Graham Carson Zirconia refractories for making steel

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100318497B1 (ko) * 1999-04-12 2001-12-22 한종웅 용융금속 흐름제어용 슬라이딩 플레이트 내화재
IL157791A0 (en) * 2001-03-26 2004-03-28 Nestle Sa Beverage powder
CN103464738B (zh) * 2013-08-21 2015-10-28 河南熔金高温材料股份有限公司 添加钛的金属结合滑板及其生产方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2066802A (en) * 1979-12-28 1981-07-15 Kurosaki Refractories Co Refractory for casting
US4386765A (en) * 1979-12-14 1983-06-07 Uss Engineers And Consultants, Inc. Composite moulded refractory articles
JPS5961567A (ja) * 1982-09-29 1984-04-07 Kurosaki Refract Co Ltd 高耐用性スライデイングノズルプレ−ト
US4720083A (en) * 1983-07-15 1988-01-19 Ceskoslovenska Akademie Ved Valve closure gate assembly for foundry ladles
JPH0677162A (ja) * 1992-08-26 1994-03-18 Yamaha Corp 半導体装置とその製法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5285025A (en) * 1976-01-08 1977-07-15 Toshiba Ceramics Co Nozzle for casting
JPS5921574A (ja) * 1982-07-28 1984-02-03 品川白煉瓦株式会社 連続鋳造用浸漬ノズル
JPS6060978A (ja) * 1983-09-08 1985-04-08 黒崎窯業株式会社 連続鋳造用ノズル組成物
JPS60127280A (ja) * 1983-12-13 1985-07-06 川崎炉材株式会社 焼成耐火物の製造法
JPH0771724B2 (ja) * 1985-12-23 1995-08-02 住友化学工業株式会社 連続鋳造用スライデイングノズルプレ−ト

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4386765A (en) * 1979-12-14 1983-06-07 Uss Engineers And Consultants, Inc. Composite moulded refractory articles
GB2066802A (en) * 1979-12-28 1981-07-15 Kurosaki Refractories Co Refractory for casting
JPS5961567A (ja) * 1982-09-29 1984-04-07 Kurosaki Refract Co Ltd 高耐用性スライデイングノズルプレ−ト
US4720083A (en) * 1983-07-15 1988-01-19 Ceskoslovenska Akademie Ved Valve closure gate assembly for foundry ladles
JPH0677162A (ja) * 1992-08-26 1994-03-18 Yamaha Corp 半導体装置とその製法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5335833A (en) * 1992-09-14 1994-08-09 Vesuvius Crucible Company Zirconia graphite slide gate plates
US20050280192A1 (en) * 2004-06-16 2005-12-22 Graham Carson Zirconia refractories for making steel
WO2005123301A1 (en) * 2004-06-16 2005-12-29 Nucor Corporation Zirconia refractories for making steel

Also Published As

Publication number Publication date
EP0299441A3 (en) 1990-01-31
KR890001666A (ko) 1989-03-28
EP0299441A2 (en) 1989-01-18
JPS6424069A (en) 1989-01-26
DE3875833T2 (de) 1993-04-08
DE3875833D1 (de) 1992-12-17
EP0299441B1 (en) 1992-11-11
BR8803539A (pt) 1989-02-08

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Owner name: KUROSAKI REFRACTORIES CO., LTD., 1-1, HIGASHIHAMA-

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